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3. F. OCONNGRx DRAFT (OKE FOR RAILWAY CARS.-

APPLICATION HLD 1uLY22, 191s. RENEWED AUG. 2?. 1911.

Lf mo Patented Oct. 9,1917.

WITNESSES: K N R.

BY W IR R 1 flvlzfi w ATTORNEY 'J STATEfi PA @fwf I HERMAN A. PQPPENHUSENZ 0F HAMMOND, INDIANA, ASSIGNOR TO GREEN ENGINEER- 1N6: COMPANY, OF EASE. CHICAGO, INDIANA, A COREOEATIONOF ILLINOIS.

FURNACE.

Specification of Letters Patent.

Application filed December 6, 191$. serial No. 135,468.

To all whom it may concern:

Be itknown that I, HERMAN A. Pores nusnn, a citizen of the United States, residing at Hammond, in the county of Lake and State of Indiana, have invented new and useful Improvements in Furnaces, of which the following is a specification.

This invention relates to furnaces, and

more particularly to furnaces of steam boilers of the commercial type, and embracing the mechanical features of stoking and air supply, namely, by the use of a traveling or movable grate, preferably of the endless chain type, and anarrangement of forced draft ducts or passages.

In furnaces of the character described, a desirable construction or arrangement of the air supply or draft involves the use of a series of compartment directly below the active grate area, each compartment being supplied with air through forced draft ducts or passages communicating with the compartments. The purpose of the arrangement is to CllXltl-Q the active grate area into a number of smaller areas, separated from each other and each supplied with air from separate air passages, thereby affording a more accurate regulation of the draft and control of the combustion of the fuel, to the end that the furnace can be operated with greater economy and efficiency.

In furnaces equipped with chain grate stokers these compartments are ordinarily located between the upper and lower leads or portions, and the air supplied thereto from the sides of the grate, and as a result the air does not pass through the lower lead of the grate prior to passing through the upper or active grate area. On the other hand, in a furnace operating under natural draft, the air enters the air space below the grate in the usual manner, passing upwardly through the lower lead of the grate and thence through the upper lead or active grate surface. The advantages of this arrangement, which is possible where natural draft is employed, but not so where forced draft is used in connection with the socalled compartment arrangement below the active grate surface, are twofold-first, the passage of the cool air upwardly through the lower portion or lead of the grate tends to cool the same, thereby materially reducing the deterioration of the grate, and, secondly, the heat absorbed, from the heated lower portion of the grate raises the temperature of the air, thus securing the advantage of prematurely heating the air before coming into contact with the fuel bed.

, The object of this invention is, therefore, to provide a construction whereby the desirable features pointed out in connection with the natural draft may be also secured where forced draft is used exclusively, this being accomplished by combining features of construction of both systems of draft, which broadly consists in drawing the air through the lower lead of the grateby mechanical means and by the same means forcing the air into the passages which supply the air to the upper lead or active grate surface.

The construction whereby this result is secured will now be fully described and in connection with the accompanying drawings, wherein Figure 1 is a View in vertical section through a furnace constructed in accordance with my invention;

Fig. 2 is a view in plan section taken on line 22 of Fig. 1, showing the arrangement of the lateral air passages and boxes;

Fig. 3 is a view also in plan section, taken on line 3-3 of Fig. 1, showing the arrangement of the sub-floor air ducts;

Fig. 4 is a cross-sectional View through the furnace, taken on line 4.- 4 of Fig. 1,

showing the air boxes and passages at the front of the furnace;

Fig. 5 is an enlarged detail view of the damper-operating device, taken on line 5-5 of Fig. 2;

Fig. 6 is an enlarged plan view of the damper-operating shaft and locking device;

Fig. 7 is'an enlarged View in crosssection through the central part of the grate, taken on line 7-7 of Fig. 1; and

Fig. 8 is an enlarged view in vertical section of the front part of the furnace, taken on line 88 of Fig. 7, and showing the arrangement of the air passages and ducts.

, Referring to the drawings, the parts of the furnacev illustrated and pertaining to the invention comprise, in general, the side walls 10, 10, of the brick construction common to furnace settings; a front wall 12; a coking breast 13, extending rearwardly and over the forward end of the fire box or combustion chamber, said front wall and coking breast supporting the forward end of the header and lower bank of boiler tubes 14..

shouldered draw bar, a yoke strap having a shoulder on one limb thereof to engage the draw bar, a removable shouldered block on the other limb to engage the draw bar, a removable ba'nd surrounding the yoke strap and block, and means for locking the block,

band and yoke together.

3. In a draft rigging, a draw bar, a yoke, and means for connecting the same comprising, a longitudinally removable block securing the draw bar against forward withdrawal from between the limbs of the yoke,

, a removable band surounding the draw bar and yoke, and means associated therewith to secure the block to the yoke.

4. In a draft riggin the combination with a shouldered draw bar, of a yoke having a gib on one of its arms arranged to co operate with one of the shoulders of the draw bar, a sleeve slidably mounted on the other arm of the yoke, said sleeve having a gib cooperating with the other shoulder of the draw bar, a band encircling the draw bar, yoke and sleeve, and a key extending transversely through said band and sleeve and engaging a portion of the yoke, forhold- A ing the parts in assembled relation.

Witnesses:

neaasee through the side walls of said band, said ke engaging the block and shoulders of the a jacent arm of the yoke.

6. In a device of the character described the combination with a U shaped yoke, o a shouldered block provided with longitudinaland transverse slots, the lon itudinal slot being adapted to receive the en of the yoke and the transverse slot to receive a key, side members extending between the arms of the yoke, and a key passing through said block and through slots in said side members.

7. In a device of the character described, the'combination with a U shapedyoke, the upper arm of which is provided with a shoulder at its front end-to cooperate with the upper shoulder of a draw bar, a sleeve fitting over the front end of the lower arm of the oke, said sleeve having a shoulder adapted to cooperate with the lower shoulder of a draw bar, a band encircling the front ends of the yoke and said sleeve, and a key extending transversely through the band and sleeve for holding the parts in assembled relation, said key engaging in opposed grooves in portions of the lower yoke arm and said sleeve, whereby to prevent sliding movement of the sleeve relatively to.

said yoke arm. 1

In witness that I claim the foregoing I have hereunto subscribed my name this 19th day of July 1916.

' JOHN F. OCONNOR.

ELIZABETH M. BRITT, LUCILLE Hreems. 

